What points does Bass argue against Epps` opinions about the differences between a white man and a black one?

From the text:

"There are monkeys among white people as well as black, when you come to that," coolly remarked Bass. "I know some white men that use arguments no sensible monkey would. But let that pass. These niggers are human beings. If they don't know as much as their masters, whose fault is it? They are not allowed to know anything. You have books and papers, and can go where you please, and gather intelligence in a thousand ways. But your slaves have no privileges. You'd whip one of them if caught reading a book. They are held in bondage, generation after generation, deprived of mental improvement, and who can expect them to possess much knowledge? If they are not brought down to a level with the brute creation, you slaveholders will never be blamed for it. If they are baboons, or stand no[Pg 268] higher in the scale of intelligence than such animals, you and men like you will have to answer for it. There's a sin, a fearful sin, resting on this nation, that will not go unpunished forever. There will be a reckoning yet—yes, Epps, there's a day coming that will burn as an oven. It may be sooner or it may be later, but it's a coming as sure as the Lord is just."